<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        h1{
            background: #ff0000;
            width: 200px;
            height: 200px;
            border: 15px dashed #000;
            padding: 20px;

            /* margin: 20px 40px 60px 80px; */
            /* margin-left: 20px;
            margin-top: 40px;
            margin-right: 60px;
            margin-bottom: 80px; */
        }
        a{
            background: #ff0000;
            width: 200px;
        }
    </style>
</head>
<body>
    <h1>
        这是标题
    </h1>
    <!-- <p>这是段落</p>
    <div>这是div</div>

    <a href="#">这是链接</a>
    <span>这是span</span>
    <button>这是按钮</button> -->
</body>
</html>